Assuming you have already installed TiddlyWeb and TiddlyWebWiki (http://tiddlyweb.peermore.com/wiki/) this is how to install the very latest development version of TiddlyDocs on your local machine :
curl http://svn.tiddlywiki.org/Trunk/contributors/SimonMcManus/tiddlyweb/tiddlydocs/install.sh >install.sh
sudo sh install.sh
cd tiddlydocs
twanager server 127.0.0.1 8080
In your browsers then goto :
http://127.0.0.1:8080/recipes/tiddlydocs/tiddlers.wiki